METHOD FOR MANUFACTURING WHITE-CAST-IRON-BASED FORGED ROLL

PROBLEM TO BE SOLVED: To provide a white-cast-iron-based forged roll having superior manufacture stability, thermal cracking resistance, abrasion resistance and accident resistance, through improving the toughness by controlling the morphology of proeutectoid carbides formed inside the white-cast-ir...

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Hauptverfasser:	AKIMOTO YOSHITSUGU, YAGO SHOJI, SEO SHIYOUICHI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS FORGE FURNACES FORGING GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS HAMMERING MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PRESSING METAL PUNCHING METAL RIVETING ROLLING OF METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a white-cast-iron-based forged roll having superior manufacture stability, thermal cracking resistance, abrasion resistance and accident resistance, through improving the toughness by controlling the morphology of proeutectoid carbides formed inside the white-cast-iron-based forged roll. SOLUTION: The method for manufacturing the white-cast-iron-based forged roll comprises the steps of: casting a steel ingot having a particular composition, which is a material for the white-cast-iron-based forged roll; taking out the steel ingot right after having been solidified from a mold; temporarily holding it at a pearlite transformation temperature or lower to control the matrix of the steel ingot, which contains Widmanstaetten carbide in addition to globular carbide and ledeburite (eutectic carbide), into a pearlite structure; then heating the steel ingot to a usual forging temperature; forging it; and then spheroidizing-annealing it to clear up Widmanstaetten carbide. COPYRIGHT: (C)2006,JPO&NCIPI